Environmental Research Institute, Shandong University, Jinan 250100, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China.
Sci Total Environ. 2013 Oct 1;463-464:1-10. doi: 10.1016/j.scitotenv.2013.05.066. Epub 2013 Jun 17.
In this study, the concentrations of polycyclic aromatic hydrocarbons (PAHs) in soil profiles and the soil properties were analyzed in Hunpu, a typical wastewater irrigation area, northeast of China. The total concentrations of 16 priority control PAHs ranged from 7.88 to 2,231.42 μg/kg. Among 16 PAHs, the most abundant was Phenanthrene and the 3- or 4- ring PAHs were predominant. The PAH concentrations were higher in the upland fields near the oil wells, whereas leaching of PAH into the groundwater caused low concentrations in the paddy fields. The geochemical indices and the results from the principal component analysis of all 16 PAHs indicated that PAHs were mainly from atmospheric dusts in the top soil in I-1P/I-3P/I-7P and through soil profiles in I-4U/I-5P/I-8U, whereas those in the bottom layers were mainly from petroleum production and wastewater irrigation in I-1P/I-3P/I-7P and through soil profiles in I-2U and I-6U. In the redundancy analysis, PAHs exhibited negative correlation with pH, depth, silt, and clay, but had positive correlation with sand and organic matter. Finally, total toxic equivalent in the soil profiles and the calculated health risk of PAHs in the surface soil using contaminated land exposure assessment model elucidated the cancer risk that PAHs pose on human health in the Hunpu region.
本研究分析了中国东北扈浦东典型污水灌溉区土壤剖面中多环芳烃（PAHs）的浓度及其土壤特性。16 种优先控制的 PAHs 的总浓度范围为 7.88 至 2231.42μg/kg。在 16 种 PAHs 中，最丰富的是菲，并且以 3 或 4 环 PAHs 为主。靠近油井的旱地中 PAH 浓度较高，而 PAH 淋滤到地下水中则导致稻田中 PAH 浓度较低。所有 16 种 PAHs 的地球化学指标和主成分分析结果表明，表层土壤中的 PAHs 主要来自大气灰尘（I-1P/I-3P/I-7P）和通过土壤剖面（I-4U/I-5P/I-8U），而底层的 PAHs 主要来自石油生产和污水灌溉（I-1P/I-3P/I-7P）和通过土壤剖面（I-2U 和 I-6U）。冗余分析表明，PAHs 与 pH 值、深度、粉砂和粘土呈负相关，而与砂和有机质呈正相关。最后，土壤剖面上的总毒性当量和利用污染土地暴露评估模型计算的表层土壤中 PAHs 的健康风险阐明了扈浦地区 PAHs 对人类健康的致癌风险。
